Antiskid-tire.



F. W. KREMER.

` ANTISKID TIRE.

, 1912. 1,078,098 Patented Nov. 11, 1913.

Y UNITEn'sTATEsPATENT oFFicE.

' FBANKLINVW. .KBEHER 0Fl CABLSTADT; NEWJEBSEY.

muslim-TIRE.

' provide a tire member having anti-skidding parts the constituentelements of which .remforce each other to -resist the skidding strain.

The invention aims to provide a tire member having anti-skidding partsy one of the constituent elements of which acts as a skidretarding element, the other o f the constituent elements of which acts as a skid-directing element cooperating with the skid-retarding element.

Another object of the invention is to provide a tire member havinganti-skidding parts whichcoperate to avoidl a jar.

A further object of the invention is to provide a tire member having an anti-skidding part reinforced in .a novel manner to resist the' initial strain andthe final strain imposed thereon by contact with the ground.

With the above and other objects in view which will appear as lthe description pro- -ceeds, the invention resides in the combina- Fig. 4 is a section upon the line A-B of Figs'l and 3; Fig. 5 is a section upon the line C-D of Figs. 1 and 3; and Fig. 6 is a section upon the line E-F of Figs. 1 'and .-3.

In carrying out the invention, a tire member 1 is provided, the same preferably being fashioned from a good grade of rubber. The tire member l1 is provided with .a plurality of continuous, V-shaped tread ribs 3,

Speciillcation of Letters Patent. Application led Apri127, 1912. Serial No. 893,609.`

constituting anti-skidding arts,the apices of the tread ri'bs 3 prefera ly lying in the median plane ofthe tire member, the arms 4 ofthe ribs {Ji-converging in acomnion direction in successive ribs. The arms 4 of each rib are alined transversely of the tire member 1. The apex of one rib 3 is extend- Patented Nov. 11,1913.-

ed across a Aline connecting the ends of the i arms 4 of an adjacent rib. Owing to the f:

angular relation of the arms 4, one arm constitutes a skid-retarding element, and the other 'arm 4 constitutes a cooperating skid? vdirectingelement. -One arm 4, moreover,

Servesl as'a' reinforcement for the other'arm 4 to resist .the skidding strain.

, The interior faces fand the exterior faces of the arms 4'of the ribs 3 slant in opposite directions longitudinally of fthe tire member l. The interior faces 5 have a maximum pitch adjacentthe apices of the ribs 3, that is, the faces 5, at the apices of the ribs approach parallelism with a line at right angles to the tire member 1. Thev exterior faces 6 of the ribs 3 have a minimum pitch adjacent the apices of the ribs. Owing to the constructions last above pointed out, the rib 3 will be reinforced, as indicated at?, at its apex and upon'V its exterior face and the varms 4 of the ribs 3 will be reinforced as indicated at. 8, upon their interior faces and adjacent their ends. v

If desired, as shown in Fig. 1, the arms 4 of successive ribs 3 may be united by longitudinal connections 9, coperating with the arms 4 to form vacuum chambers 11 along the longitudinal center of the tire member 1. These vacuum chambers 11 are so constructed that when their hold upon the ground` is broken, there will beno throwing of the dust4 and mud as the wheel rotates. This result is brought about by fashioning the chambers in such av manner that they will be vented graduall ,as contrastedwith an abrupt breaking o the vacuum'hold upon the-ground. y f f y It is tobe noted that the converging ins terior faces A5-of the arms 4 serve to deiine a reduced, venting extension at one end of each chamber 1-1.-` -Asthe wheel rotates, the venting extension willl permit the entrance of air into the chamber 11 before the remaining portions ofthe chamber are lifted free from contact with the ground by the ber does not suck up mud and dust.

The end faces 10 ofthe arms 4 lie in a common plane, arallelto the median plane of the tire mem er 1. The faces 10 together with the faces 5 define more abru t angles with respect-to the tread surfaces o `the'ribs whirl away the in such a manner that the apicesl of the ribs 3' will be forwardly disposed. Therefore', when ,the Wheels are driven, either through the medium of a prime mover Ao-r throu h contactwith the ground, the ,farms 4 oft e tread ribs 3 will be forced toward the longit-udinal .center of the 'tire member A1.

Owing to this construction, the tire member 1 will not be subjected to a lateral, expansive strain tending to separate the tire member upon opposite sides of the median plane of the wheel. This feature is notably important at the inception'of the drive, it being at this time that the 'strain upon the tire member, .tending to tear the same apart laterally, is greatest.-

, Since the apex of each rib 8 across a line connecting the ends of When the wheelf-is rot-ated, the apex of the rib'3 first comesinto contact'wlth -the ground, the initial driving'strain'fujpon the rib being greatest-at 'the apex. Itwis 'to obviate damage dueto this strain that the reinforcement denoted by the numeral 7 is p'rovided. The extremities of the arms '4 are the portions of the-ribs last to break contact with' the ground. f'To reinforce the ribs against this final strain, the reinforcement indicated at 8 is provided. projects t etarms 4 of an adjoining rib, the apex of one .rib will `come into contact with-the ground before the ends of the arms of an adjoining rib break contact with the ground. Thus,' a

' smooth and evenly running structureis `ro vided, the jar incldent to the shifting o the contact from rib to rib, being reduced to a:

minimum. ,Y e

When the wheel skids, oneof the arms 4 will act as -a' skid-directing element, the

other arm 4 acting as a. skid-retarding element. Each arm 4 serves to reinforceits j' fellow to withstand the skidding strain, vand tinuous, `divergin 'this reinforcement is notably apparent in that form of the invention which is shown 1n Fig. 1, wherein the connections 10 are em loyed.A i j hat form ofthe invention which appears in Fig. 3 comprises a tire 'member 12 and ribs 14, each comprising as'before, conarms 16, the ,-ystructure shown in Fig. 3 eing a duplicate of that shown in Fig. 1, savingthat in Fig. 3 the connections 9 areomitted.

Having `thus described the invention, what is claimed is 1. In a device of the class. described, a tire member having continuous, V-shaped ribs provided with oppositely slanting interior and exterior faces, the interior faces having a maximum pitch adjacent the apex of the rib, the external faces having a minimum pitch adjacent the apex of the rib.

2. A tire having approximately V-shaped ribs on-the tread thereof, and longitudinal ribs on opposite sides of the median line of the tread and connecting the V-shaped 'ribs at points about midway between their apices and their outer ends, said ribs servin to define vacuum chambers at the center og the tread, said chambers having V-shaped forward and rear walls and inclined venting extensions.

3. A tire having vacuum chambers aloneI the median line of the tread and arranged within the normal bearing surface of the tire, said chambers having V-shaped forward and rear walls arranged in arallelism with each other, and forming inc ined -venting extensions for said chambers, said V- shaped walls having their apices at substantially the median line of the tread.

v 4. A tire'having vacuum chambers along the median line of the tread and arrange within the normal bearing surface of the tire, said chambers having V-shaped forward and rear walls arranged in arallelism with-each other, and forming inc ined venting extensions for said chambers, said V- shaped walls having their apices at substanvtially the median line of the tread, the outer v wallsv of the vacuum chambers being parallel with the median line of the tread.

In testimony that I claim the foregoing fasm own, I have hereto aixed my slgnature' 1n 'the presence of two witnesses.

, FRANKLIN W. -KREMER SELINA WILLsoN,

RUTH Sco'rr. 

